Harmonic noise

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Jun 21, 2010 | 06:10 PM

stonecold

Thread Starter

4wd Low

Joined: Jul 2009

Posts: 13

Likes: 0

Harmonic noise

my wife's 02 disco has a harmonic whine at highway speeds above 55 mph. When you let off the gas or coast down a hill with cruise on it goes away. Any ideas???

Jun 21, 2010 | 06:17 PM

buick215

Winching

Joined: Jun 2010

Posts: 676

Likes: 0

From: Florida

Check out the harmonic balancer on the rear differential. It might be missing or loose.

Jun 21, 2010 | 06:20 PM

greg409

Winching

Joined: Jul 2006

Posts: 739

Likes: 5

From: west of chicago

My money's on U-joints -- please check them asap as if the front goes, it'll take out your transmission.

luck,greg

Jun 21, 2010 | 06:28 PM

Spike555

Team Owner

Joined: Jun 2007

Posts: 26,212

Likes: 98

From: Grand Rapids MI

Could be almost anything, how long have you had the truck?

Jun 22, 2010 | 05:14 PM

stonecold

Thread Starter

4wd Low

Joined: Jul 2009

Posts: 13

Likes: 0

I have had it for about 18 months and put about 22,000 miles on it with no problems. It has 103,000 on it right now.

Jun 22, 2010 | 05:28 PM

Spencerfitch

Pro Wrench

Joined: Apr 2010

Posts: 1,482

Likes: 8

From: Gramercy, La

Is it a changing phase kind of noise or a constant phasing sound
Could be nearly anything.

BUT on mine it does it when the A/C is on level 3 and im going 65 ish

Last edited by Spencerfitch; Jun 22, 2010 at 09:07 PM.

Jun 22, 2010 | 06:10 PM

Rovin4life

TReK

Joined: Dec 2009

Posts: 2,243

Likes: 10

From: Albany, NY

If it aint the ujoints then look at the tc, change the fluid. If it comes out with metal then you are screwed. If not sometimes if it is old it makes a noise.